4-(2-Naphthyl)-4-alkyl-3-buten-2-ones

ABSTRACT

The compounds are 4-naphthyl-4-lower alkyl-substituted -3-buten2-ones, and -2-halo-1,3-butadienes, e.g., 2-(2-(6methoxynaphthyl))-2-penten-4-one, and are useful as pharmaceuticals.

United States Patent Anderson et al.

[451 Apr. 29, 1975 4-( Z-NAPHTHYL )-4-ALKYL-3-BUTEN- Z-ONES Inventors: Paul L. Anderson, Dover, N.J.;

' Darryl A. Brittain, New York, NY.

Assignee: Sandoz-Wander, lnc., Hanover, NJ.

Filed: Aug. 20, 1973 Appl. No.: 390,033

U.S. Cl. 260/590; 260/611 F; 260/649 R;

424/33]; 424/337; 424/340; 424/353 Int. Cl... C07c 49/76; C07c 49/80; C07c 49/82 Field of Search 260/590 References Cited UNITED STATES PATENTS 4/l960 Molnar 260/590 Primary ExaminerDaniel D. Horwitz Attorney, Agent, or Firm-Gerald D. Sharkin; Richard E. Vila; Frederick H. Weinfeldt 2-[2-(6-methoxynaphthy])]-2-penten-4-one, and are useful as pharmaceuticals.

5 Claims, No Drawings 1 4-(2-NAPHTHYL)-4-ALKYL-3-BUTEN-2-ONES This invention relates to chemical compounds, and more particularly to l-alkyl-l-naphthyl-substitutedbutenes, and to the preparation of such compounds, as well as to pharmaceutical compositions containing such compounds and the use of such compounds.

The compounds of this invention may be conveniently represented by the formula I wherein R is a hydrogen atom or halo having an atomic weight of from about 19 to 80, i.e., fluoro, chloro or bromo. lower alkyl, lower alkoxy, lower alkylthio, or difluoromethoxy;

R is lower alkyl, e.g., having from one to three carbon atoms, such as methyl, ethyl, n-propyl and isopropyl; and

A is either of the structures:

l a. -C-CH3,

i.e., an acetyl function; or

wherein Z is halo having an atomic weight of from about to 80, i.e., chloro or bromo.

As used in the definitions of R, above, the terms lower alkyl, lower alkoxy and lower alkylthio, the alkyl portions thereof have, e.g. from one to four carbon atoms, such as methyl, ethyl, propyl or butyl, including isomeric forms where such exist.

Thus, Compounds 1 comprise two subclasses, de-

pending upon the nature of A; R, R and Z being as defined above:

Compounds la may be obtained by acidic treatment [Process (a)] of an appropriate butadienol of the formula II wherein R and R are as defined above.

Process (a) involves acidic treatment of a compound ll to obtain the corresponding Compound Ia, and may be carried out employing as the acidic" source a strong protonating agent in the presence of hydroxy, (lower) acyloxy or (lower) alkoxy anion, in a suitable medium, at moderate temperatures, e.g., 10 to lO0C., preferably at 15 to 35C. Where the hydroxy, (lower) acyloxy or (lower) alkoxy contributing agent is aliquid under the process conditions, it may be used in excess to serve as the medium.

Strong protonating agents include mineral acids, such as hydrochloric or hydrobromic, or sulfuric acid, and aromaticor (lower) aliphatic sulfonic acids, such as p-toluenesulfonic acid. Suitable hydroxy, (lower) acyloxy, e.g., having two to four carbon atoms, and (lower) alkoxy anion, e.g., having from one to four carbon atoms, contributing agents include lower alkanols, such as methanol, esters such as ethyl orthoformate, or organic acids or anhydrides, such as acetic acid or acetic anhydride, singly or in mixtures.

If the hydrochloric or hydrobromic acid is employed as the acidic source in process (a), then in addition to the corresponding Compound la product, a corresponding Compound lb wherein Z is accordingly either chloro or bromo, will be obtained as a co-product. Thus, by selection of reagents, either Compounds la or both classes of Compounds 1 may be obtained, as may be conveniently represented by Reaction Scheme A, wherein R, R, and Z are as defined above. When both compounds la and lb are produced, they may be separated from each other and individually recovered by conventional recovery procedures, e.g., fractional crystallization or chromatographic techniques.

REACTION SCHEME A Process 1) Process a.)

Compounds ll, the starting materials of Process (0) are either known compounds or analogs of known compounds and are obtainable by adaption of the methods described in the literature for the preparation of such compounds, e.g., the Belgian patent issuing on Belgian Application No. 124,754 (filed Nov. 29, 1972 and claiming priority of U.S. application Ser. No. 203,825 filed Dec. 1, I971).

The compounds of formula I are useful because they possess pharmacological activity in animals. In particular, the compounds I are useful as antiinflammatory agents as indicated by the Carrageenan induced edema test on rats (oral administration at 5 to 200 mg./kg.). For such use. the compounds may be combined with a pharmaceutically acceptable carrier, and such other conventional adjuvants as may be necessary, and administered orally in such forms as tablets, capsules. elixirs, suspensions and the like or parenterally in the form of an injectable solution or suspension. The dosage administered will, of course, vary depending upon the compounds used and the mode of administration. However, in general, satisfactory results are obtained when administered at a daily dosage of from about 0.5 milligram to about 175 milligrams per kilogram of body weight, preferably given in divided doses two to four times a day, or in sustained release form. For most mammals the administration of from about 30 milligrams to about 2,000 milligrams of the compound per day provides satisfactory results and dosage forms suitable for internal administration comprise from about 8' milligrams to about 1,000 milligrams of the compound in admixture with a solid or liquid pharmaceutical carrier or diluent.

As noted above, oral administration with carriers may take place in such conventional forms as tablets, dispersible powders, granules, capsules, syrups and elixirs. Such compositions may be prepared according to any method known in the art for manufacture of. pharmaceutical compositions, and such compositions may contain one or more conventional adjuvants, such as sweetening agents, flavoring agents, coloring agents and preserving agents, in order to provide an elegant and palatable preparation. Tablets may contain the active ingredient in admixture with conventional pharmaceutical excipients, e.g., inert diluents such as calcium carbonate, sodium carbonate, lactose and talc, granulating and disintegrating agents, e.g., starch and alginic acid, binding agents, e.g., starch, gelatin and acaciaJ and lubricating agents, e.g., magnesium stearate, stearic acid and tale. The tablets may be uncoated or coated by known techniques to delay disintegration and adsorption in the gastro-intestinal tract and thereby provide a sustained action over a longer period. Similarly, suspensions, syrups and elixirs may contain the active ingredient in admixture with any of the conventional excipients utilized for the preparation of such compositions, e.g., suspending agents (methylcellulose, tragacanth and sodium alginate), wetting agents (lecithin, polyoxyethylene stearate and polyoxyethylene sorbitan monooleate) and preservatives Ib Z l (i=CH-C=CH Ia. ."l.

(ethyl-p-hydroxybenzoate). Capsules preferably conl0 tain the active ingredient admixed with an inert diluent, e.g.,.a solid diluent such as calcium carbonate, calcium phosphate and kaolin or a liquid diluent such as a polyethylene glycol. The preferred pharmaceutical compositions from the standpoint of preparation and ease of administration are orally administrable compositions, particularly tablets and liquid or solid diluent-filled capsules Representative formulations of a tablet and a capsule prepared by conventional techniques are as follows:

Weight lngrcdicnt Tablet Capsule 2-[2-(6-methoxynaphthyl)1-2- penten-4-onc 50 50 Tragacanth l0 Lactose 197.5 250 Corn Starch 25 Talcum 15 3o Magnesium Stearate 2.5

In the following examples, which illustrate the invention, temperatures are in degrees eentigrade, and room temperature is 20 to C., unless indicated otherwise.

EXAMPLE 2-[2-( o-methoxynaphthyl)]-2-penten-4-one To a solution of 10 g. of 2-[2-(6-methoxynaphthyl)]- 3,4-pentadien-2-ol* in 200 ml. of anhydrous methanol is added 3 ml. of concentrated hydrochloric acid (12N). The mixture is stirred at room temperature for 3 hours and then at ice bath temperature for 2 hours. The solid which forms is filtered off and recrystallized from pentane to give 2-[2-(6-methoxynaphthyl)]- 2-penten-4-one,**m.p. l08l09C.

(nay also be designated 2-(6'-methoxy-2'-naphthyl)3,4-pentadicne2- may also be designated 4-(o-methoxy-l-naphthyl)-3-pentcn Evaporation of the filtrate gives an oil which upon separation and purification via preparative thin layer 3 ,8 80,9 3 2 6 chromatography yields 2-[2-(6-methoxynaphthyl)1-4- wherein chloro-2,4-pentadiene, m.p. 8688C. which may also be designated 4-[2-(6-methoxynaphthyl)]- 2-chloro-l ,3-pentadiene.

R is a hydrogen atom, halo having an atomic weight of from about 19 to 80, difluoromethoxy, alkyl hav- Repeating the procedure of this example, but using 5 g from to four carbon atoms alkmiy having in place of the 2 [2 (6 methoxynaphthyl)] 3,4 pen from one to our carbon atoms, or alkylthio having tadien-Z-ol, an equivalent amount of the compound of t one to f Carbon atoms; and column A there is similarly obtained the compounds of R alkyl havmg from t to 3 carbon atomscolumns B and C: 2. A compound of claim 1 wherein R is methyl.

A B C a) 2-[2-(6-chlor0 2-[2-(6-chloro- -2-[2-(6-chloro naphthyl l-3,4- naphthyl )1-2- naphthyl)]-4- pentadicn-Z-ol pentcn-4-one chIQro-ZA-pentw dienc b) 2-(2-naphthyl)- Z-(Z-naphthyU- 2-(2-naphthyl)-4- 3.4-pentadicn-2- 2-penten-4-onc chloro-2,4-pentadicnc ol c) 3-[2-(6-mcthoxy- 3-[2-(6-methoxy- 2-[2-(6-mcthoxynaphthyl 1-2- naphthyl 1-2- naphthyl l-2-methylmethyl-4,5- methyl-3-hcxcn- 5-chloro-3,5-hcxadicnc hexadicn-3-ol S-one d) 3-[2-(6-methoxy- 3-l2-(6-mcthoxy- 2-l2-(6-methoxynaphthyl) l-4,5- naphthyl 1-3- naphthyl I-S-chlorohcxadicn-B-ol hcxen-S-onc 3,5-hexadiene e) 2-l2-(6-difluoro- 2-[2-(6-difluoro- 2-l2-(6-difluoromcthoxynaphthyl methoxynaphthyl I- mcthoxynaphthyl 1-4- 3,4-pentadicn-2-ol 2-penten-4-onc chloro-2,4-pentadicnc f) 2-[2-(6-n-butyl- 2-[2-(6-n-butyl- 2-[2-(6-n-butylnaphthyl 1-3.4- naphthyl)]-2-pcntcn naphthyl ]-4-chloropentadicn-Z-ol -4-one 2,4-pcntadicne Z-l 2-(6-methylthionaphtyl l-2-pentcn- 2-[ 2-( o'mcthylthionaphthyl )1-4-chloro- 3 ,4-pentadicn- 4-one 2,4-pentadicne 2-ol h) 2-[ 2-( (a-cthoxy- 2-[ 2-( 6-cthoxy- 2-[ 2-( -cthoxynaphthyl naphthyl 1-3 ,4- naphthyl l-2- 4-chloro-2,4-pentadienc pentadien-Z-ol pentcn-4-onc What is claimed is: l. A compound of the formula 3. A compound of claim 1 wherein R is alkoxy. 4. The Compound of claim 3 wherein R is methoxy and R' is methyl.

5. A compound of claim 1 wherein R is halo having an atomic weight of from about 19 to 80, difluoromethoxy, alkyl having from one to 40 four carbon atoms, alkoxy having from one to four carbon atoms, or alkylthio having from one to four carbon atoms; and R R is as defined.

R o I ll c-cn-c-cn 

1. COMPOUND OF THE FORMULA
 2. A compound of claim 1 wherein R1 is methyl.
 3. A compound of claim 1 wherein R is alkoxy.
 4. The Compound of claim 3 wherein R is methoxy and R1 is methyl.
 5. A compound of claim 1 wherein R is haLo having an atomic weight of from about 19 to 80, difluoromethoxy, alkyl having from one to four carbon atoms, alkoxy having from one to four carbon atoms, or alkylthio having from one to four carbon atoms; and R1 is as defined. 